More four chars domains with results in the WayBack Machine

As always, all of them were available at time of posting.

o3st.com
hlpc.net
35ol.net
hei1.com
qjjx.net
515f.com
wtkj.org
s-24.net
csmg.net
jgoo.net
36ge.com
3dww.com
216m.com
kgn2.com